Low-voltage power supply
The low-voltage power supply and the fuser power supply convert AC power from the power receptacle
into DC power to cover the DC loads.
Figure 5-5 Low-voltage power supply
+3.3V
+24V
FREQSNS
REM24V
DC controller
Protection circuit
Low-voltage power supply
Fuse
FU901
Noise filter
Rectifying
circuit
Fuser
control circuit
+24V
generation
circuit
+3.3V
generation
circuit
Frequency
detection circuit
Power switch
SW801
AC input
Only for the 200V model
Noise filter
Fuser power supply
Fuse
FU801
Fuser failure detection
The DC controller determines a fuser unit failure, sets the FUSER HEATER DRIVE (FSRD+, FSRD-)
signals to inactive, releases the relay to interrupt the fuser heater power supply, and notifies the formatter
of a fuser unit failure when it encounters the following conditions.
●
Start-up failure
●
Abnormally low temperature
●
Abnormally high temperature
●
Fuser heater drive circuit failure
ENWW Engine control system 79
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